Some Microsoft Surface devices are throttling down to 400MHz
A Windows feature meant to keep a device from overheating is causing Microsoft's Surface Pro 6 and Surface Book 2 to run at a cripplingly slow speed. The problem seems to stem from a firmware update that was released on August 1st, according to TechRepublic.
from https://www.engadget.com/2019/08/15/microsoft-surface-throttling-400mhz/
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